Great question. Not "hard", no. 🙂 I've been using QWERTY for almost 40 years, so that's pretty ingrained. Like riding a bike. Also I'm still on QWERTY on my phone.
But, I do type slower on a regular keyboard nowadays. Partly because I changed my layout, and partly because the ZSA Voyager, which is my main keyboard, is both split and column-staggered, rather than row-staggered like most keyboards. It's hard to go back to rowstag after getting used to colstag. Rowstag just feels so incredibly wrong. Not at all meant for a human hand. 🤖